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Another Search Engine Redirect

Hello,
Three days ago I was using my computer and all of a sudden several error messages appeared telling me my hard drive had crashed and that it had several issues. I booted into safe mode and ran malware bytes which caught several things and deleted them. When I rebooted in non-safe mode I discovered that my desktop icons were all gone and everything in the start menu was also gone. Firefox wouldn't run (it gave me a firefox.exe is already running but not responding message even when Firefox.exe was not running) and I noticed google chrome was running very slowly and when I searched for anything in chrome it would redirect me to a different site than what I intended. At the suggestion of a friend I ran combofix, perhaps unwisely as I found out later. However, combofix seemed to fix the problem and all of my icons and shortcuts were restored and I no longer noticed the search engine redirect and firefox was fixed. The problem with the search engine redirect has now resurfaced however. I have run malware bytes and avast (including a boot time scan) and have not had any luck totally removing the problems and I don't really know what else to do. I'm running Windows 7 x64 by the way. Thank you in advance.
Edit: I've just noticed that something is also setting google chrome to be the default web browser without my permission. I use firefox normally and when I start firefox it keeps telling me it's not the default browser even though I keep changing it back to be the default.

Once the proper logs are created, then post them in a reply to this topic by using the Add Reply button. Since you have run ComboFix, please include the ComboFix log in the reply. Do NOT run it again unless instructed to do so.

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